biostudies-literatureUnknownMagne CDiputación Foral de GipuzkoaAgence Nationale de la RechercheMinisterio de Ciencia e InnovaciónUniversidad Nacional Autónoma de MéxicoEuropean CommissionWe provide direct evidence of singlet fission occurring with water-soluble compounds. We show that perylene-3,4,9,10-tetracarboxylate forms dynamic dimers in aqueous solution, with lifetimes long enough to allow intermolecular processes such as singlet fission. As these are transient dimers rather than stable aggregates, they retain a significant degree of disorder. We performed a comprehensive analysis of such dynamic assemblies using time-resolved absorption and fluorescence spectroscopy, nuclear magnetic resonance spectroscopy, and theoretical modelling, allowing us to observe the characteristic signatures of singlet fission and develop a model to characterize the different species observed. Our findings reveal that structure fluctuations within perylene-3,4,9,10-tetracarboxylate associChemical sciencehttps://www.ebi.ac.uk/biostudies/studies/S-EPMC11472385biostudies-literaturePerylene-derivative singlet exciton fission in water solution.PMC11472385ANR-23-CE29-0007PAPIIT IA202821NextGenerationEU/PRTR-C17.I1QUAN-000021-01ANR-23-CE50-009ANR-10-INBS-05PID2022-136231NB-I00Llansola-Portoles MJEcheverri AFanckevicius MJasinskas VKoepf MStreckaite SMagne CDominguez-Ojeda EBrigiano FSPascal AACasanova DHa-Thi MHPino TContreras-Garcia JQuaranta ARobert BGromova MFinkelstein-Shapiro DBoto RAGulbinas VfalsePerylene-derivative singlet exciton fission in water solution.We provide direct evidence of singlet fission occurring with water-soluble compounds. We show that perylene-3,4,9,10-tetracarboxylate forms dynamic dimers in aqueous solution, with lifetimes long enough to allow intermolecular processes such as singlet fission. As these are transient dimers rather than stable aggregates, they retain a significant degree of disorder. We performed a comprehensive analysis of such dynamic assemblies using time-resolved absorption and fluorescence spectroscopy, nuclear magnetic resonance spectroscopy, and theoretical modelling, allowing us to observe the characteristic signatures of singlet fission and develop a model to characterize the different species observed. Our findings reveal that structure fluctuations within perylene-3,4,9,10-tetracarboxylate associ2024-01-01T00:00:00Z2024 Oct2025-04-04T01:08:56.196Z2025-04-04T01:08:56.196ZS-EPMC114723853941630110.1039/d4sc04732j